{"id":"CVE-2026-89701","title":"kernel: nfsd: validate nseconds in TIME_DELEG decode paths (CVE-2026-89701)","summary":"A flaw was found in the Linux kernel's Network File System Daemon (nfsd). The TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode paths do not properly validate the nanosecond (nseconds) value in timestamps. This allows a remote attacker to pro…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-1284","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:05:32+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89701"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532154"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89701"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89701"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89701.mbox"},{"url":"https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065"},{"url":"https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c"},{"url":"https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.06249,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89701","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System Daemon (nfsd). The TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode paths do not properly validate the nanosecond (nseconds) value in timestamps. This allows a remote attacker to provide a malformed timestamp, which can then be written to disk, potentially leading to data integrity issues or unexpected system behavior.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json)\n\n**kernel: nfsd: validate nseconds in TIME_DELEG decode paths** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208453,"id":"CVE-2026-89701","ts":1790005705543,"field":"cvss","old":"6.8","new":"5.5"},{"seq":204095,"id":"CVE-2026-89701","ts":1789490231415,"field":"cvss","old":null,"new":"6.8"},{"seq":204094,"id":"CVE-2026-89701","ts":1789490231415,"field":"severity","old":"none","new":"medium"},{"seq":147668,"id":"CVE-2026-89701","ts":1789270211811,"field":"cvss","old":null,"new":"6.8"},{"seq":147667,"id":"CVE-2026-89701","ts":1789270211811,"field":"severity","old":"none","new":"medium"},{"seq":109432,"id":"CVE-2026-89701","ts":1789183731892,"field":"cvss","old":null,"new":"6.8"},{"seq":109431,"id":"CVE-2026-89701","ts":1789183731892,"field":"severity","old":"none","new":"medium"}]}